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M‐Center singlet to triplet excitation in KCl
Author(s) -
Schneider I.,
Keller F. J.
Publication year - 1973
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220600119
Subject(s) - excitation , singlet state , center (category theory) , triplet state , atomic physics , infrared , chemistry , photochemistry , materials science , physics , excited state , crystallography , optics , quantum mechanics
M centers are transformed to a triplet state either through the capture of an electron by an M + center or through the optical bleaching of an M′ center. Using a technique similar to one previously developed by Schneider, Keller, and Klick, it is found that about four times as many triplets are produced through the M + mechanism than through the M′. In these experiments, bleaching is produced with intense infrared excitation of short duration absorbed in the F′ or M′ bands for crystals which contain either M + or M′ centers. Evidence is also presented which indicates that the M + mechanism might be predominant at low temperatures for continuous excitation in the F‐spectral region.